/*************************************************************************
	> File Name: assert.c
	> Author: Angel Criss
	> Mail: abbytsing@gmail.com 
	> Created Time: 六  8/ 9 09:13:13 2014
 ************************************************************************/

#include<stdio.h>
#include<math.h>
#include<assert.h>
int  main()
{
    int num;
    fprintf(stdout,"%s\n","input a number to get its root");
    scanf("%d",&num);
    assert(num>0);
    fprintf(stdout,"%s\t%f\n","the ansower is:",sqrt(num));

    return 0;
}
